* Fix-up a TODO (support the sort_key option).
* Fix an error where True/False were being written-out
  as title-cased strings when used a dictionary keys.
* Speed-up iteration over dicts by looping over items()
  rather than keys() followed by value lookups.
* TODO:  sort only by keys, not keys and values.
diff --git a/Lib/json/encoder.py b/Lib/json/encoder.py
index 3c306ab..2beb10e 100644
--- a/Lib/json/encoder.py
+++ b/Lib/json/encoder.py
@@ -233,7 +233,7 @@
 
 
         if (_one_shot and c_make_encoder is not None
-                and not self.indent and not self.sort_keys):
+                and not self.indent):
             _iterencode = c_make_encoder(
                 markers, self.default, _encoder, self.indent,
                 self.key_separator, self.item_separator, self.sort_keys,